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We know, too, that orange cats are most often male, but just what is it that makes some cats orange? ... However, the orange cats were missing a stretch of DNA that could be involved in regulating ...
Roughly 75% of ginger cats are male. [14] Male cats with the gene for orange can be either X°Y ginger or X-Y black or non-ginger tabby. Females with the gene have three possibilities: X-X- black or non-ginger tabby, X°X° ginger, and X-X° tortoiseshell, thus male cats cannot be tortoiseshell unless they have two X chromosomes. [14]
The orange mutant gene is found only on the X, or female, chromosome. As with humans, female cats have paired sex chromosomes, XX, and male cats have XY sex chromosomes. The female cat, therefore, can have the orange mutant gene on one X chromosome and the gene for a black coat on the other. The piebald gene is on a different chromosome.
OO results in orange fur, oo results in fur without any orange (black, brown, etc.), and Oo results in a tortoiseshell cat, in which some parts of the fur are orange and other areas non-orange. [3] One in three thousand tortoiseshell cats are male, making the combination possible but rare- however, due to the nature of their genetics, male ...
Male cats therefore need only one copy of this gene, while females need both of their X chromosomes to be coded for orange coloration. Because there are more black cats than orange cats, it’s ...
This is why most orange cats are male (one copy of the orange gene from their mother on the X chromosome) but nearly all tricolor cats (calico) or tortoiseshell cats (black and orange) are female ...
Interestingly, male cats only need one copy of the "O" gene to display an orange coat, while females must have two copies. This unique genetic arrangement results in the majority of orange cats ...
Male cats, like males of other therian mammals, are heterogametic (XY). [19] The single X chromosome does not undergo X-inactivation, ergo coat color is determined by which O-gene allele is present. Accordingly, the cat's coat will be either entirely orange or melanistic (respectively X O Y or X o Y).